A dancer on ice spins faster when she folds here arms. This is due to (a) Increases in energy and increase in angular momentum (b) Decrease in friction at the skates (c) Constant angular momentum and increase in kinetic energy (d) Increase in energy an decreases in angular momentum

in a physics laboratory a block x is balanced by a block Y of mass 200 kg,each are suspended from a balance of equal lever arms .the scale pan on X is at a height.H1=2 cm ,where as scale pan on Y is at height 1 cm above the floor.the error in weighing is (in gram)

consider the figure of a single riveted lap joint as follows

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cyclic heat engine operates between. temperature of 30 C. What is the least rate of heat rejection per kW net output of an engine. source temperature of 800 C and sink

 

 

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